Tool for extracting bushings



Feb.v11, 1930. J. J. QulNT f Y 1,746,280

` TooLFoR EXTRACTING UsHxNGs Filed sept.\1-1. iaz

IN VEN TOR.

A TTORNE Y.

Patented Feb. 11, 1930 UNiTsn STATES referir ersten. i

JOHN .'r. QUINT, on rornKA, KANSAS, essrenon ro winnaars' c; francetoner-r, on

Terrine, Kansas TOOL FOR EXTRACTING IBU'iHlUKTGS` Application inea september 11, 192e. semaine. 1347862.

My invention relates to the improvements in tools for extracting bearing bushings from machine elements, and is herein shown as adapted for use in connection with the bearing bushings of pistons for internal engines.

The chief object of my invention is to produce a simple, inexpensive, sturdy and highly efficient tool for this purpose, having certain features that do not appear, and were not claimed in my former patent bearing No.

y 1,589,862, dated June 22, 1926.

A further object of my invention is to profduce a tool of this character in which the principal power element comprises a rotative a screwshaft, and can be used interchangeably with accessories to adapt the tool for both extracting bushings from and inserting them in place from one side of a machine part, as the engine piston herein shown, and thereby produce a short readily manipulable ,tool

which can be made of the necessary dimen` `sions for heavy duty work as well as smaller work.

Another object of this invention 1s to produce a tool of this character, especially adapted for extracting piston bushings, wherein the removing stresses are borne by the metal of the bushings alone and in the direction of its axis, and therefore without imposing, distortingor breaking stresses on the shell or skirt of the piston.

Further objects of this invent-ion are to otherwise simplify and improve tools of this character, and the invention consists in the elements and-combination of elements illustrated in the drawings and described'in the specification, and as pointed out in the appended claim. y a

Referring to the drawings:

Fig; 1 is a sectional view of an internal combustion engine piston showing my improved tool adapted for extracting the bushing from the bushing body.

Figs. 2 and 3 are parts which co-operate with said operating shaft to pull or extract the bushing from the bushing body.

As shown in Fig. 1 of the drawings, 10 designates a piston of a known type with the usual wrist-pin bearing 11, a skirt 12, a head 5e '13 and bearing bushings 14.

Referring first to Fig. 1, which illustrates the tool for extracting a bushing from the bearing, 15 designates an elongated screw shaft, which is provided at one `end with an enlarged head 16, having an inwardly facing `shoulder`16 and a transverse opening to receive a hand bar 17"by which the screw shafts are rotated. y

19 designates a cup-shaped compression element which is adapted to fit at its open end v against the outer side of the piston circuin` ferentiallyopposite the adjacent bearing. The closed end 20 of said compression element is provided with an opening 21 through which the smooth or Unthreaded part 22 of 65 the screw shaft loosely extends. `23 designates a nut which is threaded on the shaft 15 land is formed at its onterend with an axial prolongation 24 which is adapted to closely enter theinner end of the bushing; there beV ing formed between said axial extension and the full diameter of the nut an outwardly fac- `ing shoulder 25 which is adapted to bear against the inner end face of the bushing 14. Radially positioned thereon is a plurality of outwardly extending blade members 14 adapted to imbed into the end of the bushing 14. Y

In the use of the tool for extracting a bushingifrom the bearing of the piston, the coinpression element 19 is first placed on the screw shaft 15 which can be readily done by reason of the diameter of the opening 21 relatively to the unthreaded portion 22 of the shaft, with the end wall 20 bearing against the end face 16 of the shaft head. 16. Thereafter the threaded shaft 15 is inserted axially through the bushingto be extracted until ar-` rested by contact withthe inner end face 19 of the compression member 19 against the outer face of the piston. Just before the said screw shaft has reached its innermost posi tion, the nut 23 is threaded on the inner end of the screw shaft. After the reduced end of the nut has been set against the inner end I of the bushing and the inner end of the coniand through the bearing, and forces the bush` ing outwardly from said bearing extracting it from the piston. In this extracting oper` ation the threaded shaft 15 rotates on its axis, however, Without axial movement in itself. The chambered portion of the compression element 19 is of sufiicient axial and diametric dimensions to fully receive the extracted bushing. v

After the bushing has been removed, the tool can be readily shifted outwardly away from the bearing and detached from the piston, whereupon the nut 23 can be released from the threaded shaft after which the shaft may be freely withdrawn from the bearing and compression element It should be noted that the tool can be adapted to different bushing diameters by using a plurality of the elements 23. These are the only elements that need to be fitted with any degree of accuracy to their co-acting parts, to-wit: the bushing ends. The elements of the tool are so constructed that they may be very compactly nested when not in use and thereby avoid likelihood of losing an individual part. For instance, both the collar 28 and the nut 23 can be slipped and threaded, respectively over the shaft 15 within the compression element 19, and the nut 2T can thereafter be threaded over the shaft to close on the end of said element 19.

The mechanism herein disclosed is especially adapted for the removal of bushings without interruption of the interior or exterior walls thereof, as such changes are often required.

It will be understood that modifications relative to the size of the collar, and the threaded nut to accommodate for different diameter of bushing, while the compression element is of such size as to receive the various diameters relative to the class of work that the tool may be designed for.

Such other modifications may be employedr as lie within the scope of the appended claim.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is In a tool for extracting bushings from and replacing bushings in the bushing bodies of a piston, comprising a threaded shaft rotative in operation adapted to extend axially through a bushing and extending at one end only from one side of the piston, with means thereon to turn the shaft7 a cup compression element and a threaded nut on the shaft, a tapered short extension on the end of the nut to enter the bore of the bushing snugly as centering means for the collar axially with the bore of the bushing and protecting means for the periphery of the bore at the end while the V-shaped members imbed in the end of the bushing, a shoulder on the collar adjacent the said extension, there being a plurality of protruding V-shaped members radially posi- 

